<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->
    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>
      <section class="c-sort-box">
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
                  <a title="全部" href="#">全部</a>
                </li>
                <li v-for="(item,index) in subjectNestedList" :key="index" :class="{active:oneIndex==index}">
                  <a :title="item.title" href="#" @click="searchOne(item.id,index)">{{item.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <dl>
            <dt>
              <span class="c-999 fsize14"></span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li v-for="(item,index) in subSubjectList" :key="index" :class="{active:twoIndex==index}" >
                  <a :title="item.title" href="#" @click="searchTwo(item.id,index)">{{item.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <div class="clear"></div>
        </section>
        <div class="js-wrap">
          <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">1</i>/
              <i class="c-666 f-fM">1</i>
            </span>
          </section>
          <section class="fl">
            <ol class="js-tap clearfix">
              <li :class="{'current bg-orange':buyCountSort!=''}">
                <a title="销量" href="javascript:void(0);" @click="searchBuyCount()">销量
                  <span :class="{hide:buyCountSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':gmtCreateSort!=''}">
                <a title="最新" href="javascript:void(0);" @click="searchGmtCreate()">最新
                  <span :class="{hide:gmtCreateSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':priceSort!=''}">
                <a title="价格" href="javascript:void(0);" @click="searchPrice()">价格&nbsp;
                  <span :class="{hide:priceSort==''}">↓</span>
                </a>
              </li>
            </ol>
          </section>
        </div>
        <div class="mt40">
          <!-- /无数据提示 开始-->
          <section class="no-data-wrap" v-if="data.total==0">
            <em class="icon30 no-data-ico">&nbsp;</em>
            <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
          </section>
          <!-- /无数据提示 结束-->
          <article v-if="data.total>0" class="comm-course-list">
            <ul class="of" id="bna">
              <li v-for="item in data.items" :key="item.id">
                <div class="cc-l-wrap">
                  <section class="course-img">
                    <img :src="item.cover" class="img-responsive" :alt="item.title">
                    <div class="cc-mask">
                      <a :href="'/course/'+item.id" title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                    </div>
                  </section>
                  <h3 class="hLh30 txtOf mt10">
                    <a :href="'/course/'+item.id" :title="item.title" class="course-title fsize18 c-333">{{item.title}}</a>
                  </h3>
                  <section class="mt10 hLh20 of">
                    <span v-if="Number(item.price)===0" class="fr jgTag bg-green">
                      <i class="c-fff fsize12 f-fA">免费</i>
                    </span>
                    <span class="fl jgAttr c-ccc f-fA">
                      <i class="c-999 f-fA">34人学习</i>
                      |
                      <i class="c-999 f-fA">34评论</i>
                    </span>
                  </section>
                </div>
              </li>
            </ul>
            <div class="clear"></div>
          </article>
        </div>
       <!-- 公共分页 开始 -->
      <div>
        <div class="paging">
          <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
          <a
            :class="{undisable: !data.hasPrevious}"
            href="#"
            title="首页"
            @click.prevent="gotoPage(1)">首页</a>

          <a
            :class="{undisable: !data.hasPrevious}"
            href="#"
            title="前一页"
            @click.prevent="gotoPage(data.current-1)">&lt;</a>

          <a
            v-for="page in data.pages"
            :key="page"
            :class="{current: data.current == page, undisable: data.current == page}"
            :title="'第'+page+'页'"
            href="#"
            @click.prevent="gotoPage(page)">{{ page }}</a>

          <a
            :class="{undisable: !data.hasNext}"
            href="#"
            title="后一页"
            @click.prevent="gotoPage(data.current+1)">&gt;</a>

          <a
            :class="{undisable: !data.hasNext}"
            href="#"
            title="末页"
            @click.prevent="gotoPage(data.pages)">末页</a>

          <div class="clear"/>
        </div>
      </div>
      <!-- 公共分页 结束 -->
      </section>
    </section>
    <!-- /课程列表 结束 -->
  </div>
</template>
<script>
import courseApi from '@/api/course'

export default {
    data(){
      return{
      page:1, //当前页
      data:{},  //课程列表
      subjectNestedList: [], // 一级分类列表
      subSubjectList: [], // 二级分类列表

      searchObj: {}, // 查询表单对象

      oneIndex:-1,
      twoIndex:-1,
      buyCountSort:"",
      gmtCreateSort:"",
      priceSort:""
      }
    },
    created(){
      //课程第一次查询
     this.initCourseFirst()
     //一级分类的现实
     this.initSubject()

    },
    methods:{
        //1, 查询第一页数据
        initCourseFirst(){
          courseApi.getCourseList(1,8,this.searchObj)
            .then(response=>{
              this.data=response.data.data
            })
        },

        //2, 查询所有一节的分类
        initSubject(){
            courseApi.getAllSubject()
              .then(response=>{
                this.subjectNestedList=response.data.data.list
              })
        },

        //3,分页切换方法
        gotoPage(page){
          courseApi.getCourseList(page,8,this.searchObj)
            .then(response=>{
              this.data=response.data.data
            })
        },

        //4, 点击某个一级分类，查询出对应的二级分类
        searchOne(subjectParentId,index){

            //把传递index赋值给oneIndex, 为了active样式生效
            this.oneIndex=index
            //清空
            this.twoIndex=-1
            this.searchObj.subjectId=""
            this.subSubjectList=[]
            //把一级分类点击的id值，赋值给searchObj
            this.searchObj.subjectParentId=subjectParentId
            this.gotoPage(1)
            //subjectNestedList 已经包含所有数据
            //拿着以及分类id和所有一级分类id比较
            //如果id相同，从一级分类里面获取对应的二级分类
            for(let i=0;i<this.subjectNestedList.length;i++){
              //获取每一个以及分类对象
              var oneSubject = this.subjectNestedList[i]
              //比较id是否相同
              if(subjectParentId==oneSubject.id){
                this.subSubjectList = oneSubject.children
              }
            }
        },
        //点击某个二级分类实现查询
        searchTwo(subjectId,index){
            //把index赋值, 高亮选中样式
            this.twoIndex=index
            //把二级分类id赋值给searchObj
            this.searchObj.subjectId=subjectId
            //点击某个二级分类进行条件查询
            this.gotoPage(1)
        },

        //根据销量排序
        searchBuyCount(){
          //设置对应变量值， 为了样式生效
          this.buyCountSort=1
          this.gmtCreateSort=''
          this.priceSort=''
          
          //把值赋值到searchObj
          this.searchObj.buyCountSort=this.buyCountSort
          this.searchObj.gmtCreateSort=this.gmtCreateSort
          this.searchObj.priceSort=this.priceSort
          //调用方法查询
          this.gotoPage(1)
        },

        //根据时间排序
        searchGmtCreate(){
          //设置对应变量值， 为了样式生效
          this.buyCountSort=''
          this.gmtCreateSort=1
          this.priceSort=''
          
          //把值赋值到searchObj
          this.searchObj.buyCountSort=this.buyCountSort
          this.searchObj.gmtCreateSort=this.gmtCreateSort
          this.searchObj.priceSort=this.priceSort
          //调用方法查询
          this.gotoPage(1)
        },

       //根据价格排序
        searchPrice(){
          //设置对应变量值， 为了样式生效
          this.buyCountSort=''
          this.gmtCreateSort=''
          this.priceSort=1
          
          //把值赋值到searchObj
          this.searchObj.buyCountSort=this.buyCountSort
          this.searchObj.gmtCreateSort=this.gmtCreateSort
          this.searchObj.priceSort=this.priceSort
          //调用方法查询
          this.gotoPage(1)
        }

    }


  
};
</script>


<style scoped>
  .active {
    background: #cbebdd;
  }
  .hide {
    display: none;
  }
  .show {
    display: block;
  }
</style>